221076681 has 24 divisors (see below), whose sum is σ = 347253120. Its totient is φ = 124723872.

The previous prime is 221076679. The next prime is 221076689. The reversal of 221076681 is 186670122.

It is not a de Polignac number, because 221076681 - 2¹ = 221076679 is a prime.

It is a super-2 number, since 2×221076681² = 97749797763951522, which contains 22 as substring.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (221076689) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 2095 + ... + 21131.

It is an arithmetic number, because the mean of its divisors is an integer number (14468880).

Almost surely, 2^221076681 is an apocalyptic number.

221076681 is a gapful number since it is divisible by the number (21) formed by its first and last digit.

It is an amenable number.

221076681 is a deficient number, since it is larger than the sum of its proper divisors (126176439).

221076681 is a wasteful number, since it uses less digits than its factorization.

221076681 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 19133 (or 19126 counting only the distinct ones).

The product of its (nonzero) digits is 8064, while the sum is 33.

The square root of 221076681 is about 14868.6475847671. The cubic root of 221076681 is about 604.6642774582.

The spelling of 221076681 in words is "two hundred twenty-one million, seventy-six thousand, six hundred eighty-one".